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I did and to me it conflicted with the exception and is not clear if one overrules the other - leaving possible room for debate. BUT, by bringing my attention to 9-1 again (thank you by the way) I re-read it very closely and I think I found the final verdict in 9-1(a): "The jacketed portion of...

Hello, An ongoing debate between fabricators of ours is whether a continuous 1" water jacket on an ASME coded vessel should be included in the code boundary of U-1 stamped vessel. The jacket pressure relief device is set for 20psi. We consider the exception under U-1(c)(2)(f), however the inner...

Hi Folks and Distinguished Experts, This question pertains to having a repad for a Nozzle on the INSIDE of the vessel wall. For my "h" value per Fig UG-37.1, do I use the definition "distance nozzle projects beyond the inner surface of the vessel wall," or do I take the distance the nozzle...

I was looking in older posts about repairs to PVs. Our vessel has been stamped and shipped, and now needs a bracket on a pressure-retaining wall. I think I understand it all now as follows: ASME Code no longer applies, it is NBIC jurisdiction now. Work must be performed by someone with an R...

Thank you Haralt!

Hello, I'm struggling to make sense of UG-47 when also used with UW-19. I am trying to design a stainless steel jacketed cylindrical vacuum vessel, approx. 120" long, that can withstand 75 psig of pressure in the water jacket. With the external water pressure + vacuum my inner wall thickness...

This is great information. Thank you very much for sharing your knowledge. I struggle with interpretation of the Code at times and it is great to have advice from experienced professionals.

Good Afternoon, Question #1: I cannot find in Section VIII what to use as the limit of reinforcement for a LARGE nozzle on a torispherical head. I have a 60in OD insert nozzle on an 81in OD ASME F&D head. My recently purchased design software defaults the limit on the reinforcement area to 2x...

Thanks Metengr, I would not have considered a threaded rod or bar to apply here. Is UG-14 just stating that basically anything under NPS4 doesn't need to be an ASME fitting? This blows my mind. For this case I assume with NPT threads I just need to call out a Class 150 or greater square head...

I have a few (5) unused 1/2" NPT ports on my 10-Bar ASME coded vessel. I only have Section VIII of the the ASME Code so I don't know what is permitted to plug these holes. Can I use the cast pipe plugs we have here in stock (only has a "27A" marking on it) or do I need to purchase something...

I am designing a horizontal pressure vessel to be installed indoors, supported on 2 saddles, and rigidly mounted in a 2B seismic region. This is my first of this type and our customer has not made any indication of requirements for seismic conditions. If the job specification states...

Thank you for the response. This is a vacuum furnace - definitely a Section VIII vessel. I read the term "continuous circumferentially" in 9-2 as applying to the jacket specifically, rather than the welds. I would like to have the external weld be continuous all around for seal and other...

Regarding ASME Section VIII Appendix 9, Fig.9-5 sketch (f-1): Are both welds required to be continuous? If the design is for a furnace, how is concern about air gap between welds to be handled with regard to pressure build up high temperatures?

I'm searching for any information regarding BOLT SPACING on large custom mating flanges (48"-120”) that seal a VACUUM vessel with an O-RING. I cannot find any literature with this combination to determine minimum # of bolts. Appendix 2 and Appendix Y only seem to account for positive pressure...